add mlb-quasi-win-shares data

mlb-quasi-win-shares/README.md

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+# mlb-quasi-win-shares
+
+This folder contains data behind the story [The Twins’ Magical Run Will Likely Go Through The Yankees. (Because Of Course.)](https://fivethirtyeight.com/features/the-yankees-always-have-the-twins-number-will-this-postseason-be-different/)
+
+`quasi_winshares.csv` contains Quasi-Win Shares (QWS), prorated to 162 team games, for every player from 1901 as of Sept. 27”
+
+
+Column | Description
+-------|---------------
+`name_common` |	Player name
+`age` |	Player's age on June 30 of season
+`player_ID` |	Player's Baseball-Reference.com ID
+`year_ID` |	Season
+`team_ID` |	Baseball-Reference ID of team
+`lg_ID` |	League of team
+`pct_PT` |	Share of total team playing time (measured by plate appearances and leverage-weighted innings) for player
+`WAR162` |	Wins Above Replacement per 162 team games, averaging B-R and FG WAR
+`def_pos` |	Defensive positions played, in order of innings/games. (Will not include DH or any position for players with 0 PA.)
+`quasi_ws` |	Quasi Win Shares. Three times total wins created per 162 games; generated by adding WAR162 to wins BELOW replacement (determined by playing time) and rounding to nearest whole number
+`stint_ID` |	Order of team stints for player within season
+`franch_id` |	Lahman DB franchise ID for team
+`prev_franch` |	Previous franchise played for (NULL if player debuted for team)
+`year_acq` |	First season for player with that franchise
+`year_left` |	Last season for player with that franchise
+`next_franch` |	Next franchise played for (NULL if player retired with or is currently on team)